. The inventions : researches and writing of Nikola Tesla, with special reference to his work in polyphase currents and high potential lighting . menter. Thereare here illustrated three distinct tyjjcs of machines, which,besides (Uhers, 1 have used in my e\|)eriments. Pig. t>7 represents the machine used in my ex|)eriments beforethis Institute. The held magnet consists of a ring (»f wroughtiron with :{S4 ]»ole piojections. The armature ctmiprises a steeldisc to which ; fastened a tliin, carefull\- wchleij rim of w roni;lit HIGH FREQUENCY AND HIQH POTENTIAL CURRENTS. 153 iron. Upon the
. The inventions : researches and writing of Nikola Tesla, with special reference to his work in polyphase currents and high potential lighting . menter. Thereare here illustrated three distinct tyjjcs of machines, which,besides (Uhers, 1 have used in my e\|)eriments. Pig. t>7 represents the machine used in my ex|)eriments beforethis Institute. The held magnet consists of a ring (»f wroughtiron with :{S4 ]»ole piojections. The armature ctmiprises a steeldisc to which ; fastened a tliin, carefull\- wchleij rim of w roni;lit HIGH FREQUENCY AND HIQH POTENTIAL CURRENTS. 153 iron. Upon the riin are woTind several layers of fine, wellannealed iron wire, wliicli, when wound, is passed throughshellac. The armature ^vires are wound around brass pins,wrapped with silk thread. The diameter of the armature wirein this type of machine should not be more tlian ^ of the thick-ness of the pole projections, else the local action will be con-siderable. Fig. 98 represents a larger machine of a different type. Thefield magnet of this machine consists of two like parts whicheither enclose an exciting coil, or else are independently Fin. 07. Each part has 4S(i |ki1c itrojcctioiis, tlic |>i(>jtctioiis of tnic tai-iiii:tiioKC of the (irlicr. Tlic aiiiiiitiirc consists of a wIuh-I ot lianlhnm/.c, carrying the coiuhictors which rcvolvi hetwecn the pro-jtclioiis of the iichi iiiagiict. To wind the armature conductors,I have loinid il most convenient to |n-oceed in thi toUowingniannei-. I construct a ring tened u|)on a plate. Ihearmature c(Ui(hulors heing wound, the pins are cut ttlT and thetMids of the conductors fastiUed hv two riliy-s whiidi screw to the 154 IWVENTTONS OF XTKOLA TEf^LA. bronze rini; and the rim »>f the wlieel, respectively. Tlie wholemay then be taken olf and t<»rnis a solid structure. The eon-ductois in such a type of machine should consist of sheet copper,the tliickness of wliich, of course, de]KMids on the thickness ofthe pole ])rojections
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